Method of setting of tool for brake drum machining



E. L. STACEY Oct. 2, 1951 METHOD OF SETTING OF TOOL FOR BRAKE DRUM MACHINING Filed Nov. '7, 1947 f/VVf/VTOI? EDWARD L.$TACEY Br Arrngygm Patented Oct. 2, 1951 UNITED STATES, PATENT OFFICE METHOD OF SETTING OFTOOL FOR -BRAKE DRUM MACHINING Edward L. Stacey, Houston, Tex. Application November 7, 1947, Serial No. 784,629

This invention relates to an adaptable gauge setting tool and to a method of using the tool on a number of machines having tool stocks with axes parallel to and substantially level with the spindle axes of the machines so that the tool may be used by unskilled laborers to quickly and accurately gauge various pre-determined radial distances between the axes of spindles of various diameters and the operating edges of tool stock mounted, stock removing implements.

An object of this invention is to provide a tool having a V-block to be centered over the axes of machine spindles of various diameters, a spirit level mounted on a beam fixed to the V-block and extending perpendicularly to the axis thereof, and an arm which can be set at graduated positions on a beam fixed to the V-block and extending perpendicularly therefrom, so that the operating edges of tool stock mounted, stock removing implements will be set at pre-determined positions when their edges are engaged'against the face of the arm coincidental with the leveling of the beam by the spirit level bubble.

Another object ofthis invention is to employ a tool of this kind with machines such as brake drum lathes in a method of enlarging the inner diameters of elements, such as automobile brake drums, to pre-determined dimensions, by following the steps of using the tool as an accurate and quick means of setting the operating edge of a tool stock mounted, stock removing implement at a pre-determined radial distance from the spindle axis, setting the micrometer of the transverse feeding mechanism of the machine at zero, chucking the element on the spindle, and then feeding the stock removing implement outwardly from the spindle and into the element as it is rotated, and stopping the transverse feeding when the micrometer shows a reading which gauges the pre-determined inner diameter to which the element is to be enlarged.

Still another object of this invention is to employ a tool of this kind with machines such as brake drum lathes in a method of turning down the outer diameters of elements, to pre-determined dimensions, by following the steps of using the tool as an accurate and quick means of setting the operating edge ofa tool stock mounted, stock removing implement at a pre-determined radial distance from the spindle axis, setting the micrometer of the transverse feeding mechanism of the machine at zero, chucking the element on the spindle, and then feeding the stock removing implement inwardly toward the spindle and into the element as it is rotated, and stopping the 1 'Claim. (Cl. 51-290) transverse feeding of the tool when the micrometer shows a reading which gauges the pre-determined outer diameter to which the element is to be turned down.

Broadly this invention relates to a tool which can be employed by unskilled laborers in accurately and skillfully setting the operating edges of tool stock mounted, stock removing implements in pre-determined positions so that these edges may be moved into elements being rotated on machine spindles in order to enlarge the in-'- ner diameters, or turn down the outer diameters, to pre-determined dimensions.

With the foregoing and other objects in view reference is made to the drawings, in which:

Fig. 1 is an elevation of the gauge setting tool.

Fig. 2 is a plan view of the gauge setting tool.

Fig. 3 is an elevation of the gauge setting tool being used on a brake drum lathe to set the cutting tool in a pre-determined position.

Fig. 4 is a plan view of the lathe after the gauge setting tool has set the cutting tool and has been removed, and in this view the zero on the micrometer of the transverse feeding mechanism is shown in coincidence with the index mark on the machine base, and a brake drum in section .is shown as being chucked on the lathe spindle.

Fig. 5 is a plan view which shows the cutting tool as having enlarged the brake drum inner diameter to the required size as is indicated visually by the numeral 2 on the micrometer being in coincidence with the index mark onthe machine base.

Fig. 6 is an elevation of the gauge setting tool being used to set a grinder mounted on the tool stock, in a pre-determined position.

Fig. 7 is a fragmentary plan view which discloses how a cutting tool has been reversed in the tool stock to turn down an outer diameter, and in this view the gauge setting tool which'has set the cutting tool at a pre-determined radial distance from the spindle axis is shown, and the cutting tool is shown as having been moved parallel with the spindle axis, after having been set, so that it is adjacent to the flanged element which is to be turned down.-

Referring to the drawings in detail, the gauge setting tool I is shown as being comprised of the V-block 2 with its arms '3, the beam 4, the spirit level 5, the arm 6 which is shown as being positioned by one of the holes I which are spaced at known and pre-determined distances froma vertical center line passing through the apex :8 of the V-block. The arm t is shown as being One of these operations consists of the enlarging of worn automobile brake druminner diameters to receive shims of certain standard, outer diameters which are to be installed in the brake drums to re-line them. For instance, it-ma'y be desired to install a shim of l2.0 i 0".-outer., diameter in a brake drum of an original nominal 12" diameter which has become enlarged by wearing to some diameter intermediate between 12" and 12.040". The unskilledlaborer cannot-be relied upon to measure accurately the. dimensionz'to which the drum has .been ;worn, subtract sthis diameter from the desired shimdiameten divide .by a micrometer constantlas 2, and then move the cutting tooliagainst;the .worn brake drum, start the lathe rotating,...,and:feed the cutting tool outwardly intozthe brake drum, and finally stop, the. operationwhemthe micrometer record- .ing'the amount ofv transverse feeding reads the re- '-sultof his calculations With the device and method ofthis invention it is not necessaryfor. aniunskilledlaborer to make even simple calculatiOns..-;l-Ie only has to know the nominaldiameter of the drums on which he is to work. If the brake drurn 24 tobeworked upon is, for example, a 12" diameter brakedrum,

he takes the gauge setting r001; selects that hole on the. beam axis which corresponds to the adjacent index number l2 on the top face of the beam, and inserts the pin 9 through the hole 3| in' the arm 6 andthrough this selected .hol l, and then tightens the. set screw 10. This ,.in'- sures that the face I l. of the arm 6 extends 'perpendicularly to, and transversely of the beam axis. This hole I has been located a measured distance from the intersection of thejb'eam axis 'and the line bisecting the V-block apex angle, and this insures that the "nearest; or perpendicular distance from bisecting line to face H is 6", whic,h is the radius of the brake drum to'be; worked.

The operator now takes the gauge setting tool to the brake drum lathe I2, which has a spindle or arbor diameter within the limitations or the V-block 2, sets the V-block 2 on the spindle l3,

and levels the beam by means-of thebubble 32 is consequently set from the spindle axis ata distance equal to the brake drum radiusof-6" The gauge setting-tool] is thenputaway. V v

The micrometer I9 e is a then loosened on the shaft by taking an Allen wrench and-loosening the Allen set screw 22. The -micrometer is then turned until the zero mark thereon coincides with the index mark on the bed -plate23. The operator then tightens the set "screw 22 to bind against the shaftill-and hold the micrometer in fixed position. The-brake drum 24 is then mounted on the-spindle-l3 by means-of chucks 25 and the tool stock [6 is then fed longitudinally outward by means of any well known mechanism, not shown, until the operating edge 33 of the cutting tool I! is at the inner corner of the inside periphery 26 of the brake drum 24. The lathe spindle I3 is then rotated and the handle i4 is turned in a direction to feed the cutting tool ll into the inner brake drum periphery 26 and the feedingoperation is continued until the brake drum 24 hasbeen enlarged to the inner diameter 21, as shown in Fig. 5. At this instant the turning of the handle l4 and the movement of the micrometer-l9 has brought the numeral 2 on the micrometer l9 into coincidence with the index mark on the bed plate 23 and this numeral 2 thus indicates to the unskilled operator that the brake. drum-has been enlarged by .040", an

this invention is not-limited to the enlarging of inner diametersbut can also be used inthe turning down outer diameters to desired pre determined dimensions, Fig. 7 shows, how the scutting tool ll can be". reversed in direction of cut.- ting so that it can be fed into, and can turn down, the outer diameter of an element such; as the flanged element 25, which is being rotated on the lathe spindle. In this view the arm fi has been fixed. on'the beam 4 so, that the face H is outward from the machine spindles, and the handle M has been rotated to bring the operating edge 33 ofthecutting tool I! against theface By any well known mechanism, not shown; the tool stock Hi can be fed longitudinally, or in a direction parallel with the spindle axis and toward the bed plate 23. Fig.7 shows how. this has been done after the cutting tool I! hasfir stbeen set by the gauge setting .tool, and in this view the operatingedge 33 of the cutting tool is shown as having been. moved opposite the flangedelement 25 which is to be turned down. It now onlyremains forthe .micrometer. l9 to be,set at zero, and thenthe handle I4 can beturned to feed the cutting tool I! into the flanged element 25 until the micrometer reading shows that the flange has been turned downto a predetermined outer diameter.

A grinding wheel can also be set by the device andmethod of this invention, as .well as a cut.- ting tool. Fig.- 6 shows such a grinding wheel 28 mounted in any well known mannerona modifiedtool stock Hi. This figure shows the grinder 28 being set to grind out and enlarge an inner. diameter, but-the grinder may also be set by the gauge setting tool to grind down outer diameters in the same manner asthe gauge -is: shown being used in Fig. 7 to set the cutting toolfl for the same purpose. 7

Referring to Figs. 3, Sand 7 'of'the'drawing's; it is pointed out thatthe same gauge setting tool I has been'employed to set dimensions from lathe vspindles l3 in Fig. 3, and ;l3'..and I3" in Figs. '6 and 7 .respectively, and that each of these three lathe spindles are of different diameters, as will often be the case in machine shops "having several machines. 1 It is obviousthat changes may be made inthe construction. and..application' of the invention without-departing from the substance. and spirit thereof.: 'It is nottherefore desired toiconfine the invention-to the exact. form ofgauge'setting tool .andto. theexact methoddescibed herein, but it isgdesired tomcludehall such forms and methods which may properly come within the scope thereof.

What is claimed is:

A method of dressing to a predetermined diameter a cylindrical element which is mounted concentrically on the cylindrical axially horizontally extending spindle of a machine, the method step comprising, inserting a pin in a hole through the arm of a gauge setting tool and through the beam thereof and tightening means 10 to fix the arm at a precisely predetermined point on the beam so that a face of the arm extends perpendicular to the beam axis and parallel to the axis of a V-block fixed to one end of the beam, positioning the V-block on the machine spindle, transversely moving the operating edge of a stock removing implement ofthe machine to engage the face at a time when the beam is levelled, positioning the micrometer of the transverse feeding mechanism of the machine at a predetermined setting corresponding with the radial distance from spindle axis to the face as indicated by the pin setting in the beam, and rotating the element on the spindle while movin the implement against the element to remove stock therefrom until the micrometer indicates 6 the pre-determined diameter to which the element is to be turned.

EDWARD L. STACEY.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 323,826 Osborn Aug, 4, 1885 574,232 Alrich Dec. 29, 1896 868,074 Clark Oct. 15, 1907 1,502,806 Berg July 29, 1924 1,534,393 Joseph Apr. 21, 1925 1,554,610 Webster Sept. 22, 1925 1,598,248 Paine Aug. 31, 1926 1,686,318 Gallasch Oct. 2, 1928 1,891,185 Miller Dec. 13, 1932 1,898,136 Miller et al Feb. 21, 1933 1,902,629 Evans Mar. 21, 1933 2,015,356 Thurber Sept. 24, 1935 2,032,864 Begg et a1. Mar. 3, 1936 OTHER REFERENCES Automobile Trade Journal, June 1933, page 57. 

